Dynamo-electric machine.



R. E. HELLMUND.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED IAN.5. IsIe.

Patented Mar. 26, 1918.

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DYNAMO-ELECTR-IC JIAC- NE Speccation o Letters Patent.

Patented Mar. 26, 1918.

Application filed January 191. Serial No. 70,438.

To all 'whom t may concern:

Be it known that l, Bonora@ linnn- MUND, a subject ot the Emperor ot Germany, and a residentof Pittsburgh, in the county of Allegheny and State oit Pennsylvania, have invented a nei.'Y and useful 1mprovement in Dynamo-Electric lvlaohinesl` of Which the, `,tolloWin is a specification.

My invention relates to dynamoeelectric machines and particularly to the ventilation of heavy-duty motors ot the inclosed type.

One of the objects of my invention is to provide a machine ot the above indicated type that shall embody simple and elhcieut means for effectively preventing the overheating ot any of its parts under different conditions of operation.

Another object of my invention is to provide an electric motor or the inclosed type in which the circulation of the ventilating medium may be directed either in a closed circuit within the inclosing trame or in an open circuit from the outside atmosphere through the frame,

ln previous arrangements for providing a convertible system ot ventilation, it has been customary to direct thel circulation oi' the Ventilating air by means ot a detachable baffle that was adapted to he secured in a number of positions. Vith such an arrangement, however, it Was found necessary to open up the motor in order to maire the desired adjustment of the air baliie, which procedure Was found to be inconvenient on account of space limitations which ordinarily prevail when motors are operated on electric railway vehicles or in similar locations.

According to my present invention, l provide a means tor adapting the motor for either internal or external ventilation. in which the detachable parts are readily accessible so that any desired changes may be made While the motors are in operation.

In the accompanying drmvings, Figure 1 is a View, partially in section and partially in side elevation, of a motor embodying my invention, and Figs. 2 and 3 are fragmentary sectional views showin@i modifications of my invention.

The motor comprises an inclosing frame 1 that is provided with projections 2 for suitably supporting iield magnet pole pieces 3. A magnetizable armature core 4 is carried on a shaft 5 that is rotatably mounted in bearings 6. The bearings 6 are carried Yj housings 7 that are supported in nenings in the trame 1. The pole and the armature core 4 are pro'- ith suitable iield magnet and arma- The ot the motor, With an annular air chamber 13 that is 'formed by a lateral flange 1d that ivides the space between the end Wall.v i traine and the iield magnet Wind- 'llhe tiang'e 1st is provided with a een ,ra opening` 15 that is ot someuf'hat lgreater di .i roter than that ot the fan 11 and is so positionne that the fan 11 is adapted to discharge into the chamber 13. The tlauge 141 is further provided ivith an opening 16 adjacent to the top ot the trame 1 d the traine 1 is provided with an opening 17 'that communicates with the air chamber and extends beyond the plane of the flange 14. r1"he tram 1 is further provided, at the commutator-end oli the motor. with an opening 18 the sine ot which may he adjusted by means ot an adjustable damper 18a. rihe adjustable damper 18401 may be oit any con venientl type but is preferably termed ot coacting grid members, as described in a c0- pending application, Serial No. 25,839, tiled by lr'iyra S. lli-avis ou behalf of Joseph LeC. l avis (deceased) May et, 1915, and assigned to tie lNestinghousc Electric N:- Manufacturing Com aany,

rEhe air chamber 13 is provided with a curved air baille 19 that is detachably secured, at one end, to the flange 111 and, at the other end, to the portion ot the frame 1` adj acent the opening 17. Vith the batlie 19 secured in position as shown and With the damper 1Sa open, it is apparent that the rotation of the fan 11 will draw air into the motor through the opening 18 and then through the passage 12 in the armature to the tan. The tan 11 Will discharge the air into the chamber 13 and out through the uninclosed portion of the opening 17 to the outside atmosphere. Vhenever it is found ne trame 1 is provided, at the fan-enc. 

